Unconventional critical behavior in the weak ferromagnet BaIrO3

T. Kida; A. Senda; S. Yoshii; M. Hagiwara; T. Takeuchi; T. Nakano; I. Terasaki

doi:10.1209/0295-5075/84/27004

All issues

Volume 84 / No 2 (October 2008)

EPL, 84 2 (2008) 27004

Abstract

Issue		EPL Volume 84, Number 2, October 2008


Article Number		27004
Number of page(s)		4
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/84/27004
Published online		02 October 2008

EPL, 84 (2008) 27004

Unconventional critical behavior in the weak ferromagnet BaIrO₃

T. Kida¹, A. Senda¹, S. Yoshii¹, M. Hagiwara¹, T. Takeuchi², T. Nakano³^,4 and I. Terasaki³^,4

¹ KYOKUGEN, Osaka University - 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
² Low Temperature Center, Osaka University - 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
³ Department of Applied Physics, Waseda University - 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
⁴ CREST, Japan Science and Technology Agency - Kawaguchi, Saitama 332-0012, Japan

Corresponding author: kida@mag.cqst.osaka-u.ac.jp

Received: 7 May 2008
Accepted: 4 September 2008

Abstract

We report the results of ac/dc magnetization study of the critical behavior in a weak ferromagnet BaIrO₃. The critical temperature has been determined to be $T_{{\rm c}}$ = 182.8 K by the ac susceptibility measurement. We have analyzed our dc magnetization data near $T_{{\rm c}}$ with the help of the modified Arrott plot method. The critical exponents have been determined to be $\beta$ = 0.82±0.03, γ = 1.03±0.03, and δ = 2.20±0.01, which roughly obeys $\delta =\gamma /\beta +1$ . Using these values of $T_{{\rm c}}$ , $\beta$ , and γ, we find that each magnetization-field-temperature (M-H-T) behavior below and above $T_{{\rm c}}$ obeys a scaling relation, following a single equation of state in which $M/|\varepsilon |^{\beta}$ is uniquely related to $H/|\varepsilon |^{(\gamma +\beta )}$ where $\varepsilon \equiv (T-T_{{\rm c}})/T_{{\rm c}}$ . These findings demonstrate that the ferromagnetic transition in BaIrO₃ belongs to a new universality class of the second-order phase transition.

PACS: 75.40 Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) / 75.60.Ej – Magnetization curves, hysteresis, Barkhausen and related effects / 71.30.+h – Metal-insulator transitions and other electronic transitions

© EPLA, 2008

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